Locomotive-furnace.



No. 820,451. PATENTED MAY 15, 1906. E. H. WADE 6 J. L. NICHOLSON.

LOUOMOTIVE FURNACE. APPLICATION FILED SEPT. 13,1904.

a 8HBETSSHEET 1.

No. 820,451 PATBNTED MAY 15, 1906. E. H. WADE Gz J. L. NICHOLSON.

LOCOMOTIVE FURNACE. APPLICATION FILED SEPT, 13,1904.

No. 820,451. PATENTED MAY 15, 1906. E. H. WADE 6: J. L. NIGHOLSON.

LGGOMGTIVE FURNACE. APPLICATION FILED BEP'I.13,1904.

3 SHBETS-8HEET 3.

Fig. 1, andFig. 10 is a sectional view of a group of intermediate bricks in the rear arch on the line i I of Fi 1.

As shown in the drawings, 2 represents the boiler-shell, which contains the furnaces, whereof 3 is the crown-sheet; 4 4, the side walls; 5, the rear wall; 6, the front wall or fine-sheet; 7, the grate, and 9 9 the usual arch-supporting water-tubes, which extend from the lower part of the front water-leg 10 to the upper part of the rear'water-leg 10. 11 11 are the boiler-fines, and 12 is the furnacedoor.

The furnace-chamber contains two hollow arches composed ofrefractory bricks. The front arch rests upon the arch-tubes 9 and contains air-heating channels 13, the lower ends of which communicate with the airthimbles, tubes, or hollow stay-bolts 14 'in the front water-leg 10. The channels 13 open into the cavity 16 at the u per end of t e arch, and said cavity is provided with an inclined or deflecting surface 17, the effect of which is to turn and project the heated air downwardl u on the fire and across the throat of t e urnace. -The novel features which distinguish the front arch from others will be described hereinafter. The rear arch is arranged below the u per rear ends of the arch-tubes 9, immediate yabove the furnacedoor. The bricks composing the rear arch are preferably curved, arched against each other, and are supported by lugs 18 on the side walls of the furnace. Said rear arch has air-channels l3 and a cavity 16 communicating with air-tubes 14 in the rear waterleg. The rear arch has a deflecting-surface 17, and, as in the case of the front arch, the incoming air is rojected therefrom u on the fire and across t e throat. It should e here noted that the streams of air from the two arches converge upon a line above the fire and together form a com lete air-barrier beneath the throat of the urnace. The gases and other fuel products which rise from the fire on the grate can only reach the furnacethroat and the combustion-chamber--the s ace above the archesby passing through t is airbarrier, and the effect is to enrich said gases and roducts with oxygen, thereby insuring comp eteness of combustion.

Aside from the described relations of the arches and the arch-tubes to provide the airbarrier, the particular novelty in this a plication resides in the construction of the ront arch. It is well known that although the furnace-arches in present use are composed of a number of sections or bricks they cannot be taken down, brick by'brick, after the furnace has once been used, because the bricks fuse to ether. Hence when it is necessary to i'eac the fluesheet of the furnace the arch must be destroyed, with consequent waste of labor and material. The arch of our invention is composed of a number of bricks, and in this regard is like other arches; but the middle bricks of our arch are made wedge shape, like unto a keystone, and between the several bricks we place a non-fusible material, such as silicon or asbestos 24 which )revents the fusing of the 'oints, and as the ricks do not fuse the mi dle bricks may at any time be lifted out and set to one side, as shown in Fig. 5, to form a recess or alley through the arch, thus permitting free access to the entire flue-sheet. Said arch is composed of several tiers of bricks 20, 21, and 22. The intermediate tiers 21 are identical, and the number used determines the height and length of the arch. The arch is flat in eross-sectionthat is, it need not be curved like the rear arch, as it is supported on the arch-tubes 9. Upon viewing the arch from the end it will be seen that the inner ends of the outer bricks in each tier are beveled and that the middle brick has the appearance of a keystone. Vertical joints between the bricks are thus avoided and the middle bricks are made easy to sli into lace or to remove. We prefer that t e mi dle bricks shall be supported by the outer bricks and shall tend to thrust said bricks outwardly. The bottom and the intermediate bricks are provided with oval air-passages, (see Fig. 10,) while the terminal bricks have the cavities 16, containing the deflecting-surfaces 17. (See Fig.9.) The non-fusible materialsilicon or asbestos-between the bricks serves to close the joints and prevent leakage of air from the arch-channels. Thus we secure an arch which is tight at all joints and yet one that may be easily taken down even after lon use. If desired, the outer bricks of the arc may be permitted to fuse together that is, t e non-fusible material may be used only in the middle brick-joints, said middle bricks being the on] parts of our arch which need be removed w en access to the boilerfines is required. It will be observed that the air-supply tubes 14 for the front arch are arranged in the front water-leg directly beneath the c lindrical portion of the boiler. It will also be seen that the boiler-fines are 0111 slightly above the lower ends of the arc -tubes.

In most furnaces an arch of the thickness of ours if wholly above the arch tubes would be too high to communicate with the middle air-tubes 14 and would also block or stop ofi the lower fines of the boiler. The air for the arch-channels may be supplied through tubes -in the grate or through the sides of the fire-,box; but to avoid closing the lower boiler-fines and to provide for the direct supply of air to the middle channels 13 of the arch we emplo a lower tier of bricks 20, that conforms to t e most convenient arrangement of the air-tubes 14. This arrangement is shown in Figs. 1 and 3, wherein it will be seen that the tubes 14 for the middle i-loomch 13; are considerably beneath 'the ni r pair-s of tubes 14 belonging to the chennvb in tho ouier bricks ol' the arch. The lower ends of the outer bottom bricks are ,I'elnl ivcly elevated, corresponding in osition lo the horizontal portion of the ore i-tubes, nhiloihe bottom middle brick is relatively depressed. (See Figs. 1,3, 5, and 6.) 'A periion oi the middle brick hangs l'ietween the arch-tubes 9 9, and the passages 13 therein are in substantial :ilincniont with the possugcs in the upper bricks, desr-endiiig to a point that is beneath the bottom of the oyliudricnl portion of the boiler. and in this- \\i].. communication is established between the passages in the middle arch bricks and the lower pair of airtubes 14-. We prefer to taper the air-passages 13 in the middle brick oi ibc bottom tier, as shownfin Fig. 7; but said passages may take different forms. 'lhe tops of the middle bricks may be flat or crowned, as shown. it is obvious that numerous modifications of our invention will readily sug est themselves to one skilled in the art, am we therefore do not; voniine the invention to the specific constructions herein shown and described.

Having thus described our invention, we claim as new and desire to secure by Letters lntcnt 1. A locomotive-boilcr having a furnace provided with arch-tubes ecmnceting its front and rear water-lags, in combination with a front; arch su ported upon said urchtubes. and a rear arch suitably supperied bencnth Said arelrtubeg both said arches havin; passages for sup iiying heated on to the furnace and adapted to projectthe currents of air from each arch below the other and hence across the opening or throat between said arches, substantially as deeciibed.

2. A ioconmtive-boiler having a. furnace rovided with arch-tubes connecting its Font and rear Waterdegs, in combinet-ion with 21 front arch su )ported upon said urchnbes, and n rear arch suitably supported beni-uih said tubes, both Said erchcs having airpassagee communicating with the outer air and deflectors for projectio air-currents from both arches across am 'hfll'lfliiih the opening between said arches, substantially as and for the purpose specified.

3. A iocomotive-boiler having a furnace rovided with arch-tubes that connect the rent and rear water-logs of the boiler, said furnace having a. door, air-entrance tubes ex tending. through the rear wnterdeg, an arch f refractory material arranged beneath said I passages comentrance tubes arranged at different elevaurch-tnbes, said arch hevih munir-ating with said eir-tubz.s, and also proi'ided with 21. bottom cavity and a downwardly-inclined deflect-ilug-surface, air-entrance inbce arranged in said from waterlrr, beneath the cylindrical part oiiluboiler, 11 bunt w. h wmposed of refractory bricks resting upon said arch-tubes, asscges or channels In said bricks, communicating with the air-tubes in the front water-leg, and said arch having a disoharge-eevity and on inclined. deflecting-curfew at its upper end, substantially as described.

4. A loeomotive-boiler and its'furnaee, in combination with an arch composed of refraotory bricks suitably supported and noperated by non-fusib n'iatcriai, substantially as and for the purpose specified.

5. A loeommire-boiler and its furnace, in combination with an arch arranged in said furnace and composed of refractory bricks, and non-fusible material arranged between said bricks, and'pormitting the removal of certain bricks, to afford. access to the boiler flue-sheet, subsra-ntiallv as described.

6. A kwomotivoboiler and its furnace, in combination wish an arch arranged in said furnace, and composed of refractory bricks, certain of which resemble keystones, and non-fusible materiel rovided in the joints between the letter our the other bricks of the arch, substantially as and for the purpose specified.

7. A locomotive-boiler and its furnace, in combination with an arch composed of outer rows of bricks hevin beveled inner ends, and a middierow of brie s resembling keystones and edapted to fit between the outer rows of bricks, non-fusible material in the joints between said bricks, and all said bricks boi mg in. substantiall the same plane, substantiully as describe 8. A locomotive-boilor and its furnace, in combination wit: a front arch, in said furnace, composed of a plurality of rows of bricks, the bricks of one row resembling kevstones and adapted to be removed without disturbin the other bricks, to permit access to the boiler flue-sheet, substantially as described.

9. A boiler-furnace, its flue-sheet and archtube s, in combination with a. substantially flat arch composed of refractory bricks rest iug upon saiderch-tubes, and the middle row of bricks being separated from the others and from each other b non-fusible material, substantially as and ior the purpose specified.

10. A boiler and its furnace, having a ilue sheet and arch-tubes, in con'ibinetiou wil h an arch resting upon said arch-tubes and (Hillposed of a plurality of channeled bricks and a set of recessed deflector-bricks, the channels of said bricks conrinmnicetiup, with the outer air and non-fusible iluiteriol so aerating the several bricks, substantially as described 11. A locomotivwboilcr and its furnace, flue-sheet and lines, in combiimt-iou wiihairtions'in the front "ililN dog of the boiler, and an arch composed of channeled refractory bricks, forming cxicnsione of su-i-d air ubes and the bottom of said ar h being lower at the middle ihnn iii other points, to avoid in- I terference with. said Hues, substantially as described.

12. A locomotive-boiler having the usual furnace, water-legs, fluc shcet and fines, in combination witharclrtubes arranged in the furnace and connecting the front and rear Wat er-legs, air-entrance tubes arranged in the front water-leg at different elevations beneath the cylindrical portion of the boiler, an arch composed of refractory bricks resting upon said arch-tubes and provided with air-channels and deflecting-surf aces, and the bricks of the lower tier in said arch conforming in she e to the ositions of res ective air-tubes,su stantia ly as describei 13. A locomoti f e-boiler, containing a furnace and fines and having the usual waterlegs, in combination with arch-tubes arranged in the furnace and communicating with the front water-leg, beneath said flues, air-entrance tuhes extending through said front water-leg tile iniddle air-tubes being lower than the others, and a hollow brick arch arranged on said arch-tubes, and having a bottom, middle brick which han s between said arch-tubes and the airchannc s of which communicate with said middle air-tubes, substantially as described.

In testimon whereof we have hereunto set our hands, t is 7th day of September, A. D. 1904, in the presence of two witnesses.

EVAN H. W'ADE.

JOHN L. NICHOLSON Witnesses: (J. G. H AWLEY,

JonN R. LEFEVRE. 

